Occasionally I will meet people who have become experts in their field. But they are far from happy. They jealously guard their knowledge like treasure, and expect huge reward for their skill. But they rarely get rewarded. Why?
Knowledge is power. But knowledge - like every other planetary thing must circulate. So knowledge - like water - will stagnate unless it flows.
If you truly want to progress anywhere, you must raise the competency of those about you. I regularly see people stuck in technical jobs at the top of their pay band, because they refuse to teach others their skill.
Don't be too protective of your skills. In this fast-changing world, they will soon be redundant. Make sure you are learning the next new things and moving on, rather than clinging to the familiar.